Heat exchanger



FIG. 1 is perspective view of the heat exchanger of our new design.

FIG. 2 is an elevational view of the front thereof.

FIG. 3 is an elevational view of the back thereof.

FIG. 4 is a top plan view.

FIG. 5 is an elevational view of the right end thereof, as shown in FIG. 4.

FIG. 6 is an elevational view of the left end thereof, as shown in FIG. 4.

FIG. 7 is an bottom plan view thereof.

FIG. 8 is a cross sectional view through line 8-8 of FIG. 2; and,

FIG. 9 is a cross sectional view through line 9-9 of FIG. 2.

The broken line elements shown in FIG. 8 are environmental elements and form no part of the my new design. 

CLAIM The ornamental design for a heat exchanger, as shown and described. 